Air-regulating device for glass-drawing machines.



' PATENTED AUG. 13, 1907.

I. .A. MILLIRON. AIR REGULATING DEVICE FOR GLASS DRAWING MACHINES.

' APPLICATION FILED JUNE 5,1906.

2 SHEETS-SHEET 1.

No. 863,200. PATENTED AUG. 13, 1907.

I. A. MILLIRON. AIR REGULATING DEVICE FOR GLASS'DRAWING MACHINES.

APPLICATION FILED JUNE 5,1906.

2 SHEETS-SHEET 2.

I max. I m a I Inventor Cir rrrrnn sra'rns IRA A. MILLIRON, OF FRANKLIN,PENNSYLVANIA.

AIB-REGULATIN G DEVICE FOR GLASS-DRAWING- MACHINES. I

No. 863,200. I

Applicationflled June a, 1906. Serial No. 320,303.

Specification of Letters Patent.

Patented Aug. 13, 1907.

To all whom it may concern:

Be it known that I, IRA A. MILr.rRoN,a citizen of the United States,residing at Franklin, in the county of Vcnango and State ofPennsylvania, have invented certain new and useful Improvements inAir-Regulating Devices for Glass-Drawing Machines, of which thefollowing is a specification, reference being had therein to theaccompanying drawings,

My invention relates to methods and apparatus for drawing hollowarticles of glassware, such as cylinders, from a bath or body of moltenmetal, and consists in the improvements hereinafter described, anddefined in the appended claims.-

In the accompanying drawings I have illustrated glassdrawing apparatusembodying my improvements, in two somewhat different forms.

Other apparatus suitable for the practice of my invention may be devisedby those skilled in the art, and I intend herein to illustrate andparticularly describe only the forms which I regardas preferable.

Figure l is a view in elevation of such apparatus, portions of the samebeing shown in section, and the upper portion broken away. This viewshows the position and relation of the parts at or about the beginningof the drawing operation. Fig. 2 is a similar view showing the apparatusat or about the completion of the drawing operation. Fig. 3 is anelevation of a modified form of apparatus; Figs. 4, 5, 6, 7 and-8 aredetails.

Referring first to Figs. 1 and 2:

A tubular bait 1 is mounted in a vertically movable carriage 2, throughwhich extends a blow pipe 3, said bait being provided at its upper endwith a stuffing box 4, to prevent leakage of air around said pipe 3. Thebore.of bait 1 is somewhat larger than the outside diameter of pipe 3.

In bait 1, at any point intermediate the stuffing box and the lower openend, is formed an air passage 5, which leads into the verticalperforated vent-pipe-G which is attached to carriage 2, and is movabletherewith. The upper end of said vent-pipe enters a larger pipe 7, whichis closed at the top, and is of sufiicient length to receivesubstantially all of pipe 6. Pipe 7 is provided at its lower end with astuffing-box 8, through which pipe 6 passes, and leakage of air is thusprevented at this point. The perforations arranged lengthwise of thepipe 6 constitute in effect a unitary elongated vent port, which isgradually closed, or reduced in area, as hereinafter described. I

Pipe 7 is attached td a vertically movable carriage 9 and passes looselythrough a guide 10, thisconstruction being for the purpose of providingfor a certain amount of vertical movement or adjustment of said pipe,the object of which adjustment will be hereinafter more fully set forth.

To pipe 3 is attached a flexible conduit or air-pipe 3,

whichmay lead to any suitable source of airor other fluid underpressure, not shown.

The operation of the apparatus is substantially as follows:Preparatoryto beginning the drawing operation, carriage 2 is lowered for thepurpose of dipping the lower end of the bait 1 into llllQlIlOltCIl glass11; this also withdraws vent-pipe 6 from pipe 7,- leaving the greaterportion of said pipe 6 exposed, so that air may escape through theperforationsfi therein. 1 When bait 1 becomes properly heated, so thatmolten glass adheres thereto, air or other fluid adapted to exertpressure upon the interior of the article is admitted to pipe 3 and abubble 12 is blown which, as carriage 2 and bait l are raised, lengthensinto a cylinder of glass. A portion of the air which has entered thecylinder by way of pipe 3, passes up through the bait into the ventpipeand escapes through the perforations, but as carm'age 2 rises, and thecylinder of glass lengthens, pipe 6 is telescoped, or passes into pipe7, thus leaving fewer perforations 6 open to the atmosphere,consequently less air escapes from pipe 6, and a larger portion of itremains in the cylinder. The amount or length of exposed, perforatedpipe may be varied, by raising or lowering carriage 9, and the rate ofspeed at which the vent-pipe 6 enters pipe 7'may be regulated by raisingboth carriages together, but causing carriage 9 to rise more slowly thancarriage 2t hat is, by giving to said carriages a differential motion.

The apparatus shown in Fig. 3 and the details related thereto aresubstantially as fol1ows:To a vertically- -movable carriage A isattached a tubular bait B through which extends a blow-pipe 0. Air issuppliedto pipe C through a flexible conduit D.. The air passes into thecylinder E which is being drawn and may escape therefrom-through'thebait B, an escape-port F being formed in said bait, through which airescapes by way of the regulating valve, which is mounted upon carriage Aand constructedas follows:The cylinder G has a very narrow slot Hextending longitudinally of one side thereof, which slot communicateswith an air-chamber H, Fig. 6, which is directly connected ed in abracket 6 provided therefor, upon the end of position, as shown in Fig.3, piston I is'drawn clear out,

so that it stands in the position shown in Fig. 7, and air has a freepassage or escape through the valve, as

' up and the cylinder of glass E lengthens, piston I moves toward theother end of the cylinder G, thus rewith the interior of bait B. Thepiston I in the cylin- I which pinion K meshes. Pinion K is revolublympuntthe valve-cylinder Cr. When carriage A is at'its lowest shown bythe arrows in Fig. 6. As the carriage moves ducing the amount of airwhich passes through the valve.

In the operation of the apparatus above described the volume andpressure of the air passing through the blow-pipe into the cylinder aremaintained constant,

and a means of escape for a portion of the air within the cylinder isprovided, which is open at all times, but is gradually reduced in size,as the drawing operation progresses. In this respect my apparatus issubvalves, which are adjusted to yield and open only to stan'tiallydifferent from devices supplied with safetya pressure exceeding apredetermined amount, and, to close again as soon as the pressure hasbeen suiliciently reduced. v

My invention is not limited to the employment of air alone, but otherfiu'id adapted to exert the desired pressure upon the interior of thecylinder may be used,-

means for automatically varying the area of said airescape during thedrawing operation.

2. in air-regulating apparatus for glass-drawing machines, means foradmitting air to the interior of the article being drawn, means forpermitting the escape of air,- from said article, and means forautomatically decreasing the area of said air-escape as the drawingoperation progresses. y

3. In apparatus for drawing glass articlea'altubiiiar bait, means formoving said bait, a blow-pipae itending through said bait and adapted todeliver airto theart'rle being drawn, a vent-pog for the escape of fairdfromv said bait, andmeans forautomhtically decreasing theaceafioi',said vent-port as the operation progressesj t l 4. In air-regulatingapparatus jprglass-drawing ma chines, a verticallydnovable carriageatubular bait flittached thereto, a blow-pipe extendingjthroiighsaidmait,and constriicted to deliver air tothe interior of the article beingdrawn, an air-escape in said halt, a perfdrated pipe with the interiorof which said esc ape communicates, said perforations being open to theatmosphere at the beginning of the drawing operation, and automaticmeans fior gradually preventing the escape of air from said perforationsas the drawing operation progresses.

5. in the manufacture of hollow glass articles, drawing the article froma body of'molten glass, supplying air to the interior of the articlebeing drawn, permitting a-portion of such air to escape from the articlethroughout the drawing operation, and gradually decreasing the quantityof escaping 'air as the drawing operation progresses.

6. In a glass-drawing apparatus, a bait or glass-drawing tool, having apassage leading from an air-supplyftolthe interior of the cylinder, anda constantly open passage or.

